The ST2K has a built-in auxiliary light that can be used for a daytime running light where applicable, or as an auxiliary positioning light. The plug on this light bar has an extra blue wire coming out near the junction, and this wire needs to be extended and then run into a 12v source to activate the small auxiliary light on the bar.
Wiring this part of the bar is OPTIONAL and does not affect the brightness of the bar at night.
Common places to pick up the 12v signal are
- Ignition (try picking it up at the windscreen wiper motor)
- An existing DRL on the vehicle